Birds stay in the air by creating lift, which is generated when air passes over their wings, creating greater pressure below the wing than above it. This Mountain Bluebird is taking advantage of a specific type of pressure called dynamic pressure, which is created by moving air rather than by the bird’s wingbeats. It’s the same kind of pressure you feel when you’re struck by a strong gust of wind.
This video accompanies Chapter 5, Avian Flight, Handbook of Bird Biology, 3rd Edition from the Cornell Lab of Ornithology and Wiley Publishing.
Recorded by Eric Liner